More than 15 percent of the latest batch of former Secretary of State Hillary Clinton’s emails released Saturday contain classified information, with three of the messages being labeled “secret” — continuing to add to the questions surrounding her email use.

One of the messages is an extensive missive from David Satterfield, a top U.S. diplomat to Egypt, who told top officials in both the White House and State Department about negotiations in the Sinai. The entire contents of the messages are now deemed “secret,” though there is no indication they were marked as such at the time. The message was forwarded to Mrs. Clinton by top aide Jacob Sullivan.